写我的第一个C程序，我不能让过去这个愚蠢错误 [英] Writing my first C program and I can't get past this dumb bug

问题描述

我使用的是X code，因为我发现调试器是非常有用的。所以在调试我看，我输入后学生的名字命名[0] = \\ 0不管。但随后名称的其余部分是正确的。例如，如果我把约翰，它会回来说\\ 0，O，H，N。请帮助？

 字符名称[MAX_NAME_LENGTH]
        焦炭部[MAX_DEPT_LENGTH]
        INT排名;
        INT空= 0;        的printf（\\ n请输入学生的名字：）;
        scanf函数（％S，＆安培;名）;
        的printf（\\ n请输入学生处：）;
        scanf函数（％S，＆安培;部门）;
        的printf（\\ n请进入大学排名：）;
        scanf函数（％d个，＆安培;等级）;
        的strcpy（studentArray [空] .name和名）;
        的strcpy（studentArray [空] .department，部门）;
        studentArray [空] .rank =排名;
 

解决方案

做到这一点：

 的printf（\\ n请输入学生的名字：）;
    scanf函数（％S，名）;
    的printf（\\ n请输入学生处：）;
    scanf函数（％S，部门）;
    的printf（\\ n请进入大学排名：）;
    scanf函数（％d个，＆安培;等级）;
 

请注意没有＆符号的前两个调用 scanf函数。这是因为编译器隐式转换名称和部门进入指针到相应的数组的第一个元素（＆放大器;名称[0] ，＆放大器;部门[0]，当他们在一个前pression使用）（有是expections此规则，请参见这里详情）。

这以备将来参考。

I'm using xCode because I found the debugger to be very useful. So in the debugger I see, after I enter the students name name[0] = \0 no matter what. But then the rest of the name will be correct. For example, if I put John, it will come back saying \0, o, h, n. Help please?

        char name[MAX_NAME_LENGTH];
        char department[MAX_DEPT_LENGTH];
        int rank;
        int empty = 0;

        printf("\nPlease enter the students name: ");
        scanf("%s", &name);
        printf("\nPlease enter the students department: ");
        scanf("%s", &department);
        printf("\nPlease enter the students rank: ");
        scanf("%d", &rank);


        strcpy(studentArray[empty].name, name);
        strcpy(studentArray[empty].department, department);
        studentArray[empty].rank = rank;

解决方案

Do this:

    printf("\nPlease enter the students name: ");
    scanf("%s", name);
    printf("\nPlease enter the students department: ");
    scanf("%s", department);
    printf("\nPlease enter the students rank: ");
    scanf("%d", &rank);

Note the absence of ampersands in the first two calls to scanf. This is because the compiler implicitly converts name and department into pointers to the first elements of the respective arrays (&name[0], &department[0]) when they are used in an expression (there are expections to this rule, see here for details).

Read this for further reference.

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